5V-to-3.3V, Synchronous, Step-Down

Power-Supply Controller

2

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ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

PGND to GND ........................................................................±2V

BST to GND ...............................................................-0.3V, +15V

LX to BST.....................................................................-7V, +0.3V

Inputs/Outputs to GND

DH to LX...........................................................-0.3V, BST + 0.3V

REF Short to GND.......................................................Momentary

REF Current.........................................................................20mA

20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW

Operating Temperature Ranges:

MAX767CAP/MAX767_CAP.................................0°C to +70°C

MAX767EAP/MAX767_EAP ..............................-40°C to +85°C

Lead Temperature (soldering, 10sec) .............................+300°C

PARAMETER

Oscillator Frequency

DH Sink/Source Current

MIN

TYP

MAX

1

260

300

340

UNITS

SS Source Current

A

2.50

4

6.5

(BST - LX) = 4.5V, DH = 2V

DL On Resistance

µA

Current-Limit Voltage

200

7

80

100

120

mV

Ω

3.80

4.20

kHz

V

Line Regulation

High or low

0.1

%

Oscillator SYNC Range

SS Fault Sink Current

DH On Resistance

2

mA

7

3.24

3.30

3.36

Ω

240

350

kHz

SYNC High Pulse Width

High or low, (BST - LX) = 4.5V

120

200

200

µA

ns

0.7

1.0

mA

SYNC Low Pulse Width

200

ns

SYNC Rise/Fall Time

Output Voltage (FB)

200

ns

Oscillator Maximum Duty Cycle

89

92

4.5

5.5

V

95

%

Input Low Voltage

3.17

3.35

3.46

V

0.8

V

Input High Voltage

2.40

3.32

3.50

3.60

V

Input Current

±1

µA

DL Sink/Source Current

1

A

CONDITIONS

SYNC = 3.3V

SYNC = 0V or 5V

CS - FB

Falling edge, hysteresis = 1%

MAX767, MAX767R, MAX767S

FB = CS = 3.5V

Not tested

SYNC = 3.3V

SYNC = 0V

SYNC, ON

ON

0mV < (CS - FB) < 80mV,

(includes load and

line regulation)

SYNC

SYNC, ON = 0V or 5V

DL = 2V

Load Regulation

2.5

%

(CS - FB) = 0mV to 80mV

3.46

3.65

3.75

MAX767R

MAX767S

MAX767, MAX767T

ELECTRICAL CHARACTERISTICS

Reference Voltage (REF)

3.26

3.30

3.34

V

MAX767T